Recent questions tagged sec-b

A series LCR circuit with $L= 0.12 H,C= 480\;nF,R= 23 \Omega $ is connected to a $230\;v$ variable frequency supply .For What frequencies of the circuit half the power at resonant frequency . What is the Q factor of the given circuit ?

asked Sep 19, 2016 by meena.p

1 answer

A series LCR circuit with $L= 0.12 H,C= 480\;nF,R= 23 \Omega $ is connected to a $230\;v$ variable frequency supply .For What frequencies of the circuit half the power at resonant frequency . What is the current amplitute at these frequencies?

asked Sep 19, 2016 by meena.p

1 answer

A series LCR circuit with $L= 0.12 H,C= 480\;nF,R= 23 \Omega $ is connected to a $230\;v$ variable frequency supply .What is the source frequency for which average power absorbed by the circuit is maximum ? obtain the value of this mass power

asked Sep 19, 2016 by meena.p

1 answer

A circuit containing a $80\;mH$ inductor and a $60 \mu F$ capacitor in series is connected to a $230\;v,50\;Hz$ supply . The resistance in the circuit is negligible. obtain the current amplitude and V.M.S value of potential drop across each element .

asked Sep 16, 2016 by meena.p

1 answer

A circuit containing a $80\;mH$ inductor and a $60 \mu F$ capacitor in series is connected to a $230\;v,50\;Hz$ supply . The resistance in the circuit is negligible. obtain the current amplitude and V.M.S value

asked Sep 15, 2016 by meena.p

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Keeping the source frequency equal to the resonating frequency of the series LCR circuit , if the three elements L,C and R , an arranged in parallel , show that the total current in the parallel LCR circuit, is a minimum at this frequency . obtain the r.m.s value of current in each branch of the circuit for the elements and source whose values are $L= 5.0 \;H,C= 80\;\mu F, R= 40 \Omega$ for this frequency

asked Sep 15, 2016 by meena.p

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A $100 \mu F$ capacitor in series with a $40 \Omega$ resistance is connected to a $110\;V,60Hz$ supply , What is the time lag between maximum and voltage maximum ?

asked Sep 15, 2016 by meena.p

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A $100 \mu F$ capacitor in series with a $40 \Omega$ resistance is connected to a $110\;V,60Hz$ supply , What is the maximum current in the circuit ?

asked Sep 15, 2016 by meena.p

1 answer

An LC circuit a $20\;mH$ inductor and a $50 \mu F$ capacitor with an initial charge of $10\;mc$ The resistance of the circuit is negligible. Let the instant the circuit is closed be $t=0$, At what time is the total energy should equally between the inductor and the capacitor?

asked Sep 14, 2016 by meena.p

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A plane electro magnetic wave of frequency $25\;MHz$ travels in free space along the x- direction At a particular point in space and time the electric vector $\overrightarrow{E}= 6.3 v/m \hat j$. calculate $\overrightarrow{B}$ at this point .

asked Aug 22, 2016 by meena.p

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You are given a $2 \mu F$ parallel plate capacitor .How would you establish an instantaneous displacement current of $1\;MA$ in the space between its plate ?

asked Aug 22, 2016 by meena.p

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An E.m wave with poynting vector $6\;walt/m^2$ absorbed by a surface of area $12\;m^2$ Find the force on the surface .

asked Aug 22, 2016 by meena.p

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The magnetic field of a beam emerging from a filter facing a flood light is given by $B = 12 \times 10^{-8} \sin (1.20 \times 10^7\;z -3.60 \times 10^{15}t)T$ What is the average intensity of the beam ?

asked Aug 22, 2016 by meena.p

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In a plane electromagnetic wave, the electric field oscillates sinusoidal at a frequency of $2.0 \times 10^{10}\;Hz$ and amplitude $48 vm^{-1}$. What is the wavelength of the wave ?

asked Aug 17, 2016 by meena.p

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Suppose that the electric field amplitude of an electromagnetic wave is $E_0 = 120 N/C$ and its frequency is $\gamma = 50.0 \;MHz$ . Find the expression of $\overrightarrow{E}$ and $\overrightarrow{B}$

asked Aug 17, 2016 by meena.p

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Suppose that the electric field amplitude of an electromagnetic wave is $E_0 = 120 N/C$ and its frequency is $\gamma = 50.0 \;MHz$ . Determine $B_0, w,k$ and $\lambda$

asked Aug 17, 2016 by meena.p

1 answer

A parallel plate capacitor made of circular plates each of radius $R=6.0\;cm$ has a capacitance $c= 100\;pF$. The capacitor is connected to a $230\;v$ a.c supply with an angular frequency of $300\;rad\;S^{-1}$ . What is the r.m.s value of the conduction current ?Determine the magnitude of Bata point 3.0 cm from the axis between the plates

asked Aug 16, 2016 by meena.p

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The figure shows a capacitor made of two circular plate each of radius 12 cm and separated and separated by 5.0 mm . The capacitor is being changed by an external source (not shown in the figure ). The changing current is constant and equal to $0.15\;A$ Calculate the capacitor and the rate of change of potential difference between the plates

asked Aug 16, 2016 by meena.p

1 answer

Consider the so called D -T reaction (deuterium - tritium fusion ) $_1H^2 +_1H^{3} \to _2He^{4} +n$ consider the radius of both detriment and tritium to be approximately $2.0\;fm$ . What is the kinetic energy needed to overcome the coulomb repulsion between the two nuclei? To what temperature must the gases be heated to initiate the reaction ?

asked Aug 9, 2016 by meena.p

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Consider the fission of $_{92}U^{238}$ by fast neutrons. In one fission event , no neutron are emitted and the final stable end products , after the beta decay of the primary fragments are $_{58}Ce ^{140}$ and $_{44}Ru ^{99}$ . Calculate Q for this fission process . The relevant atomic and particle masses are :$m(_92U^{238})=238.05079\;u$$m(_{34} Ru^{99}) = 98.90594\;u$$m(_{58}Ce^{140})=139.90543\;u$

asked Aug 9, 2016 by meena.p

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Under certain circumstance , a nucleolus can decay by emitting a particle more massive than an $ \alpha$ particle . Consider the following : $_{88}Ra^{223} \to _{86} Rn ^{219} +_2 He ^{14}$ Calculate the Q value for this decay and determine if it energetically possible .

asked Aug 9, 2016 by meena.p

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Under certain circumstance , a nucleolus can decay by emitting a particle more massive than an $ \alpha$ particle . Consider the following : $_{88}Ra^{223} \to _{82} Pb ^{209} +_6C^{14}$ Calculate the Q value for this decay and determine if it energetically possible .

asked Aug 5, 2016 by meena.p

2 answers

The neutron separation energy is defined to be the energy required to remove a neutron from a nucleus. Obtain the neutron separation energy of the nuclei $_{20}Ca ^{41}$ from the following data :$_{13} Al ^{27} \to _{13}Al^{26}+_0 n^1$

asked Aug 5, 2016 by meena.p

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The neutron separation energy is defined to be the energy required to remove a neutron from a nucleus. Obtain the neutron separation energy of the nuclei $_{20}Ca ^{41}$ from the following data : $m(_{20}Ca^{40})=39.962591\;u,m(_{20}Ca^{41})=40.962278\;u,m(_{13}Al^{27})=26.981514\;u$

asked Aug 5, 2016 by meena.p

1 answer

From the relation $R=R_0A^{1/3}$, where $R_0$ is a constant and A is the mass number of a nucleus , show that the nuclear matter density is nearly a constant (ie independent of A)

asked Aug 4, 2016 by meena.p

1 answer

Calculate the height of potential barrier for a head on collision of two denterons. The effective radius of deuteron can be taken to be $2 fm$ . Note that height of potential barrier is given by the coulmb repulsion between two denterons when they just touch each other .

asked Aug 3, 2016 by meena.p

1 answer

The fission properties of $_{84}Pu^{237}$ are similar to those of $_{92} U^{35}$ . The average energy released per fission is $180\;Mev$ How much energy in Mev is released if all the atoms in 1 kg of pure $_{94} Pu ^{239}$ undergo fission .

asked Aug 3, 2016 by meena.p

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Suppose we think of fission of a $_{26}Fe^{56}$ nucleus into two fragment $_{13} Al ^{26}$. Is the fission energetically possible ? Argue by working out Q of the process. cives.

asked Aug 3, 2016 by meena.p

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The Q value of a nuclear reaction $A+b=c+A$ is defined by $[m_A+m_b-m_c-m_d] C^2$ where masses refers to the respective nuclei. Determine from the given data the Q value of the following reaction and state whether the reaction are exothermic or endothermic . $_6C^{12}+_6C^{12} \to _{10}Ne^{20} +_2He^4$

asked Aug 2, 2016 by meena.p

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The Q value of a nuclear reaction $A+b=c+A$ is defined by $[m_A+m_b-m_c-m_d] C^2$ where masses refers to the respective nuclei. Determine from the given data the Q value of the following reaction and state whether the reaction are exothermic or endothermic .$_1H^1+_1H^3 \to _1H^2 +_1H^2$

asked Jul 22, 2016 by meena.p

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The nucleus $_{10} Ne ^{23}$ decays by $\beta ^{-}$ emission. write down the $\beta^{-}$ decay equation and determine the maximum kinetic energy of the electrons emitted from the following data. $ m (_{10} Ne ^{23} ) = 22.994466\;amu \;\qquad m (_{11} Na ^{23} ) = 22.989770\;amu $

asked Jul 22, 2016 by meena.p

1 answer

The radio nuclide $_6C^{11}$ decays according to $_6C^{11} \to _5B^{11}+e^++\gamma$ half life $=20.3\;min$ The maximum energy of the emitted position is $0.960\;Mev$ given the mass values $m(_6C^{11})=11.011434 \;u\;m (_6B^{11})=11.009305$ calculate Q and compare it with maximum energy of position emitted .

asked Jul 13, 2016 by meena.p

1 answer

Given $m(_{86} R_n ^{220} =220.1137\;u; m(_{84}Po^{216})=216.00189u$ and $m_{\alpha}=4.00260 \;u$ Find the Q value and K.E of the emitted $ \alpha$ particle in the $\alpha$ decay of $_{86} Rn ^{220}$

asked Jul 13, 2016 by meena.p

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Find the Q value and the kinetic energy of emitted $\alpha$ particle in the $\alpha$ decay of $_{88} Ra ^{226}$

asked Jul 13, 2016 by meena.p

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The half life of $_{38} Sr ^{90}$ is 28 years . What is the disintegration rate of $15\;mg$ of this isotope?

asked Jul 13, 2016 by meena.p

1 answer

Obtain the amount of $_{27}Co^{60}$ necessary to provide a radio active source 0f $8.0\;mci$ strength. Half life of $_{27} Co ^{60}$ is $5.3$ years

asked Jul 13, 2016 by meena.p

1 answer

The normal activity of living carbon containing matter is found to be about 15 decays /min for every gram of carbon . This activity arises from the small proportion of radioactive $_6C^{14}$ present with the ordinary $_6C^{12}$ isotope. When the organism is dead , its interaction with the atmosphere Which maintains the above equilibrium activity ,ceases and its activity begins to drop. From the known half life $(=5730 years) $ of $_6C^{14}$ and the measured activity , the age of the specimen can be approximately estimated the approximate age of the Indus valley civilization

asked Jul 12, 2016 by meena.p

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A radio active isotope has a half of T years. How long will it take the activity to reduce to $1\%$ of its original activity .

asked Jul 12, 2016 by meena.p

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The three stable isotopes of neon :$Ne^{20}, Ne^{21},Ne^{22}$ have respective abundances of $90 .51 \%, 0.27\%$ and $9.22\%$ . The atomic masses of three isotopes are $19.99$ amu , $20.99\;amu$ and $21.99\;amu$ Obtain the average atomic mass of neon .

asked Jul 11, 2016 by meena.p

1 answer

Two Stable isotopes of lithium $^6_3Li$ and $^7_3 Li$ have respective abundances of $7.5\%$ and $92.5 \%$ These isotopes have messes $6.01512$ amu and $7.01600$ amu respectively . Find the atomic height of lithium

asked Jul 11, 2016 by meena.p

1 answer

What is the minimum energy that must be given to a H- atom in ground state so that it can emit an $H_{\gamma}$ in Balmer series? If the angular momentum of the system is conserved what would be the angular momentum of such $H_{\gamma}$ proton ?

asked Jul 8, 2016 by meena.p

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An electron makes a transition from orbit $n=4$ to the orbit n=2 of a hydrogen atom. What is the wave length of the emitted radiation? (R= Rydberg's constant}

asked Jul 8, 2016 by meena.p

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In which series of hydrogen spectrum , the transition involve the largest changes of energy ?

asked Jul 8, 2016 by meena.p

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The energy of an electron in an excited hydrogen atom is $-3.4 \;ev$ calculate the angular momentum of the electron according to Bohr's theory .

asked Jul 8, 2016 by meena.p

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Using the Bohr's model , calculate the speed of the electron in a hydrogen atom in the $n= 1,2$ and 3 levels

asked Jul 6, 2016 by meena.p

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A hydrogen atom initially in the ground level absorbs a photon, which excites it to $n=4$ level. Determine the wave length and frequency of photon .

asked Jul 6, 2016 by meena.p

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What is the shortest wave length present in the paschen series of spectral lines ?

asked Jul 5, 2016 by meena.p

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Relativistic correction become necessary when the expression for the kinetic energy $\large\frac{1}{2}$$mv^2$ becomes comparable with $mc^2$ where m is the mass of the particle . At what de- broglie wave length will relativistic correction become important for an electron ?

asked Jul 4, 2016 by meena.p

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Why should gases be insulators at ordinary pressures, and start conducting at low pressures.

asked Jun 30, 2016 by meena.p

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Find the typical de- Broglie wave length associated with a Helium gas at room temperature $(27^{\circ})$ and latm pressure, and compare it with the mean separation between two atoms under there conditions .

asked Jun 29, 2016 by meena.p

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